WO2022120656A1

WO2022120656A1 - Blood pressure measurement method and apparatus, and electronic device

Info

Publication number: WO2022120656A1
Application number: PCT/CN2020/135009
Authority: WO
Inventors: 李华飞
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2022-06-16
Also published as: KR20220083972A; CN113080913A; US20220175261A1; EP4039182A1; KR102595148B1; EP4039182A4; EP4039182B1; WO2022121192A1

Abstract

A blood pressure measurement method (100) and apparatus (101), and an electronic device (10), which have relatively accurate blood pressure measurement results and are convenient for measurement. The blood pressure measurement method (100) is applied to a blood pressure measurement apparatus (101). The method comprises: acquiring blood pressure calibration information, wherein the blood pressure calibration information is information obtained by means of performing processing according to a first pressure acting on a user and a first PPG signal when the first pressure acts on the user (S110); acquiring a second PPG signal, and obtaining an initial blood pressure of the user by means of performing processing according to the second PPG signal (S120); and calibrating the initial blood pressure according to the blood pressure calibration information, and taking the blood pressure obtained by means of calibration as the blood pressure of the user (S130). The blood pressure measurement method (100) does not require the assistance of an external device such as a sphygmomanometer. Blood pressure calibration information determined according to a first PPG signal and a first pressure is directly acquired according to the blood pressure measurement apparatus (101) itself, an initial pressure determined according to a second PPG signal is acquired, and the initial blood pressure is calibrated by means of the blood pressure calibration information, such that a relatively accurate blood pressure of a user can be obtained.

Description

Blood pressure detection method, device and electronic device

technical field

The present application relates to the field of electronic technology, and more particularly, to a blood pressure detection method, device, and electronic device.

Background technique

Blood pressure is one of the important parameters to measure the human cardiovascular system, and it has important significance in disease diagnosis, treatment process and prognosis judgment. At present, the mature blood pressure detection methods on the market are cuffed detection methods based on auscultation or oscillometric methods. Among them, auscultation requires a professional operator to judge blood pressure based on the sound of blood flow in the brachial artery, which is suitable for medical scenarios; The oscillometric method is to first inflate the cuff to block the arterial blood flow, and then detect the gas pressure in the cuff and extract the weak pulse wave during the exhaust process, and detect it according to the change of the pulse wave with the pressure in the cuff. blood pressure value.

With the development of living standards, the sphygmomanometer using the above-mentioned cuff detection method has gradually entered more daily use scenarios. For hypertensive patients, the accuracy of blood pressure measurement and the portability of the sphygmomanometer are very important. , Although the sphygmomanometer with cuff detection method is more accurate in blood pressure measurement, it is not easy to carry and cannot meet the needs of all-weather blood pressure monitoring and cannot meet the needs of hypertensive patients.

Therefore, to provide a blood pressure detection device with accurate blood pressure detection results, which is capable and easy to carry, has great application prospects and market value.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a blood pressure detection method, device, and electronic device, which have relatively accurate blood pressure detection results and are convenient for detection.

A first aspect provides a blood pressure detection method, applied to a blood pressure detection device, including:

Obtaining blood pressure calibration information, the blood pressure calibration information is information obtained by processing the first photoplethysmography PPG signal according to the first pressure acting on the user and the first photoplethysmography PPG signal when the first pressure acts on the user;

acquiring a second photoplethysmography PPG signal, and processing the second PPG signal to obtain the user's initial blood pressure;

The initial blood pressure is calibrated according to the blood pressure calibration information, and the calibrated blood pressure is used as the blood pressure of the user.

In the technical solutions of the embodiments of the present application, when the second PPG signal is detected, the accuracy of the blood pressure measured based on the second PPG signal is relatively low. At this time, the blood pressure calibration information determined according to the first PPG signal and the first pressure is obtained directly from the blood pressure detection device itself without the assistance of external equipment such as a sphygmomanometer, and the blood pressure calibration information is provided to the blood pressure calibration information determined according to the second PPG signal. The blood pressure calibration information calibrates the initial blood pressure, and uses the more accurate blood pressure obtained from the calibration as the user's blood pressure. In addition, if only relying on the first PPG signal and the first pressure to determine the blood pressure value, the first pressure needs to act on the user every time the blood pressure is detected, which is cumbersome to operate and causes a bad experience for the user. However, in the embodiment of the present application, the blood pressure calibration information obtained by the previous processing can be obtained to calibrate the current initial blood pressure obtained according to the second PPG signal, so there is no need for the first pressure to act on the user every time the blood pressure is detected. The first pressure and the first PPG signal are detected, so that the accuracy of blood pressure detection can be further improved, the convenience of blood pressure detection can be improved, and the user experience can be improved.

In some possible implementation manners, the acquiring blood pressure calibration information includes: driving a pressure applying module to apply pressure to the user to form the first pressure; controlling the first pulse wave detection module to detect when the first pressure acts on the user the first PPG signal; control the pressure detection module to detect the first pressure; receive the first pressure and the first PPG signal, and determine the blood pressure calibration information according to the first pressure and the first PPG signal.

In some possible implementations, the acquiring blood pressure calibration information includes: controlling the prompting module to output a prompting signal, the prompting signal being used to prompt the user to apply pressure to the blood pressure detection device to form the first pressure; controlling the first pulse The wave detection module detects the first PPG signal when the first pressure acts on the user; controls the pressure detection module to detect the first pressure; receives the first pressure and the first PPG signal, according to the first pressure and the first PPG signal A PPG signal determines the blood pressure calibration information.

In some possible implementations, the first pressure changes from high to low or from low to high over time.

In some possible implementations, the acquiring a second photoplethysmography PPG signal, and processing the user's initial blood pressure according to the second PPG signal, includes: controlling a second pulse wave detection module to detect the user's first blood pressure Two PPG signals; receiving the second PPG signal, and processing the second PPG signal by the pulse wave analysis method or the pulse wave transit time measurement method to obtain the initial blood pressure of the user.

In some possible implementations, the first pressure varies with time, and the determination of the blood pressure calibration information according to the first pressure and the first PPG signal includes: according to the magnitude of the first pressure, corresponding to the first pressure The first PPG signal is sorted to form an envelope signal of the first PPG signal; the first blood pressure of the user is determined according to the envelope signal; the first blood pressure is used as the blood pressure calibration information.

In some possible implementations, calibrating the initial blood pressure according to the blood pressure calibration information, and using the calibrated blood pressure as the blood pressure of the user, includes: using the blood pressure calibration information as the direct current component of the blood pressure of the user, and using the blood pressure calibration information as the direct current component of the blood pressure of the user, The initial blood pressure is used as the AC component of the user's blood pressure; the AC component of the user's blood pressure is calibrated according to the DC component of the user's blood pressure, and the calibrated blood pressure is used as the user's blood pressure.

In some possible implementations, before acquiring the second photoplethysmography PPG signal, the blood pressure detection method further includes: determining whether the user is in an exercise state; if not, acquiring the second PPG signal; if so, After an interval of a preset time period, it is re-determined whether the user is in a state of exercise.

In some possible implementations, the acquiring a first photoplethysmography PPG signal includes: acquiring the first PPG signal at a first part of the user; the acquiring a second photoplethysmography PPG signal includes : acquire the second PPG signal at a second part of the user, wherein the second part is different from the first part.

In some possible implementations, the first part is the user's finger, and the second part is the user's wrist.

In a second aspect, a blood pressure detection device is provided, comprising a processor configured to: acquire blood pressure calibration information, where the blood pressure calibration information is based on a first pressure acting on a user and when the first pressure acts on the user information obtained by processing the first photoplethysmography PPG signal; obtain the second photoplethysmography PPG signal, and process the user's initial blood pressure according to the second PPG signal; obtain the initial blood pressure according to the blood pressure calibration information Calibration is performed, and the blood pressure obtained by calibration is used as the blood pressure of the user.

In some possible implementations, the processor is configured to: drive the pressure applying module to apply the first pressure to the user to form the first pressure; control the first pulse wave detection module to detect that the first pressure acts on the user the first PPG signal at the time of the user; control the pressure detection module to detect the first pressure; receive the first pressure and the first PPG signal, and determine the blood pressure calibration information according to the first pressure and the first PPG signal.

In some possible implementations, the blood pressure detection device further includes: the pressure applying module electrically connected to the processor and the first pulse wave detection module electrically connected to the processor.

In some possible implementations, the processor is configured to: control the prompting module to output a prompting signal, where the prompting signal is used to prompt the user to apply pressure to the blood pressure detection device to form the first pressure; control the first pulse wave The detection module detects the first PPG signal when the first pressure acts on the user; controls the pressure detection module to detect the first pressure; receives the first pressure and the first PPG signal, according to the first pressure and the first The PPG signal determines this blood pressure calibration information.

In some possible implementations, the blood pressure detection device further includes: the prompting module electrically connected to the processor and the first pulse wave detection module electrically connected to the processor.

In some possible implementations, the processor is configured to: control the second pulse wave detection module to detect the second PPG signal of the user; receive the second PPG signal, and use pulse wave analysis or pulse wave transit time The measurement method processes the second PPG signal to obtain the initial blood pressure of the user.

In some possible implementations, the blood pressure detection device further includes: the second pulse wave detection module electrically connected to the processor.

In some possible implementations, the first PPG signal varies with the magnitude of the first pressure; the processor is configured to: sort the first PPG signal according to the magnitude of the first pressure to form the first PPG signal The envelope signal of the PPG signal; the first blood pressure of the user is determined according to the envelope signal; the first blood pressure is used as the blood pressure calibration information.

In some possible implementations, the processor is configured to: use the blood pressure calibration information as the DC component of the user's blood pressure, and use the initial blood pressure as the AC component of the user's blood pressure; according to the DC component of the user's blood pressure The AC component of the user's blood pressure is calibrated, and the calibrated blood pressure is used as the user's blood pressure.

In some possible implementations, before the processor is configured to acquire the second photoplethysmography PPG signal, the processor is further configured to: determine whether the user is in a motion state; if not, acquire the second PPG signal; if yes, after a preset time period, re-determine whether the user is in a state of exercise.

In some possible implementations, the processor is configured to: acquire the first PPG signal at a first part of the user; acquire the second PPG signal at a second part of the user, wherein the second The site is different from the first site.

In a third aspect, an electronic device is provided, including: the second aspect or the blood pressure detection apparatus in any possible implementation manner of the second aspect.

In some possible implementations, the electronic device is a smart watch.

Description of drawings

FIG. 1 is a structural block diagram of an electronic device to which the biological information detection system in the present application is applied.

FIG. 2 is a schematic structural diagram of a device for acquiring photoplethysmography using a photoelectric sensor.

FIG. 3 is a waveform characteristic diagram of a pulse wave.

FIG. 4 is a schematic diagram of the relative relationship among the ECG waveform, the PPG waveform and the PTT.

FIG. 5 is a schematic flowchart of a blood pressure detection method according to an embodiment of the present application.

FIG. 6 is a schematic flowchart of another blood pressure detection method according to an embodiment of the present application.

FIG. 7 is a schematic diagram of a prompt signal according to an embodiment of the present application.

FIG. 8 is a schematic flowchart of another blood pressure detection method according to an embodiment of the present application.

FIG. 9 is a schematic flowchart of another blood pressure detection method according to an embodiment of the present application.

FIG. 10 is a schematic diagram of a waveform of a first PPG signal changing with a first pressure according to an embodiment of the present application.

FIG. 11 is a schematic flowchart of another blood pressure detection method according to an embodiment of the present application.

FIG. 12 is a schematic flowchart of another blood pressure detection method according to an embodiment of the present application.

FIG. 13 is a schematic structural block diagram of a blood pressure detection apparatus according to an embodiment of the present application.

FIG. 14 is a schematic structural block diagram of another blood pressure detection apparatus according to an embodiment of the present application.

FIG. 15 is a top view of a smart watch according to an embodiment of the present application.

FIG. 16 is a bottom view of the smart watch in FIG. 15 .

FIG. 17 is a side view of the smart watch of FIG. 15 .

FIG. 18 is a schematic structural block diagram of another blood pressure detection apparatus according to an embodiment of the present application.

19 is a bottom view of another smart watch according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

It should be understood that the specific examples herein are only for helping those skilled in the art to better understand the embodiments of the present application, rather than limiting the scope of the embodiments of the present application.

It should also be understood that, in various embodiments of the present application, the size of the sequence numbers of each process does not imply the sequence of execution, and the execution sequence of each process should be determined by its function and internal logic, rather than the embodiment of the present application. implementation constitutes any limitation.

It should also be understood that the various implementation manners described in this specification may be implemented individually or in combination, which are not limited by the embodiments of the present application.

Unless otherwise specified, all technical and scientific terms used in the embodiments of the present application have the same meaning as commonly understood by those skilled in the technical field of the present application. The terminology used in this application is for the purpose of describing specific embodiments only and is not intended to limit the scope of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The present application can be applied to a biological information detection system, including but not limited to a blood pressure detection system. The biological information detection system can be applied to various types of electronic devices, and the electronic devices can be smart wearable devices, mobile phones, tablet computers, mobile medical devices, etc., wherein the smart wearable devices can include at least one of the following devices Items: watches, bracelets, anklets, necklaces, glasses, or head-mounted devices; mobile medical devices may include at least one of the following devices: blood sugar monitoring devices, heart rate monitoring devices, blood pressure measuring devices, temperature measuring devices, etc. The application embodiments do not limit this.

FIG. 1 shows a structural block diagram of an electronic device to which the biological information detection system in this application is applicable.

As shown in FIG. 1 , the electronic device 10 may include a bus 110 , a processor 120 , a memory 130 , an input/output interface 140 , a display 150 , a communication interface 160 and a biological information detection system 170 .

Bus 110 may include circuitry that enables communication (eg, control messages or data) between components in electronic device 10 . Processor 120 may include one or more types of data processors for performing data processing. Memory 130 may include volatile memory and/or non-volatile memory. It may store instructions or data related to other functional components in the electronic device 10 .

The input/output interface 140 may be used to receive instructions or data input from a user or an external device, and then transmit them to other functional components in the electronic device 10, or may output instructions or data generated by other functional components in the electronic device 10 to the electronic device 10. user or external device.

The display 150 may include, for example, a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED) display, or other types of displays. The display 150 may display various types of content, such as text, images, videos, icons, etc., to the user. Further, the display 150 may include a touch screen, and the user may input relevant instruction information through the touch screen.

The communication interface 160 may be used to implement communication between the electronic device 10 and external devices, such as a web server or other electronic devices. As an example, the communication interface 160 may be connected to a communication network through wireless or wired communication to communicate with external devices. The wireless communication includes but is not limited to cellular communication or short-range communication. Wired communication includes but is not limited to at least one of Universal Serial Bus (Universal Serial Bus, USB), High Definition Multimedia Interface (High Definition Multimedia Interface, HDMI), Recommended Standard 232 (RS-232) or other communication methods.

The biometric information detection system 170 is used to detect the biometric information of the user, the biometric information includes but is not limited to: the user's heart rate, blood oxygen saturation, blood pressure and other parameter information, which can be obtained by testing the user's pulse wave, in other words , the biological information detection system 170 in this embodiment of the present application may be used to detect the pulse wave of the user, and obtain one or more kinds of biological feature information of the user based on the calculation and analysis of the pulse wave.

In some embodiments, the electronic device 10 may omit at least one of the above components, or may further include other components, which will not be described in detail here.

Specifically, the embodiments of the present application relate to a blood pressure detection method and a blood pressure detection device, which can be applied to the biological information detection system 170 in FIG. 1 and set in the electronic device 10 in FIG. 1 . And more specifically, the embodiments of the present application relate to a cuffless, pulse wave-based blood pressure detection method and a blood pressure detection device, which have the advantages of portability, continuous non-invasive measurement, and high measurement accuracy.

For ease of understanding, related concepts involved in the present application are first described.

(1) Pulse wave

Pulse wave refers to the periodic fluctuation of the arterial wall caused by the periodic changes in arterial pressure and volume during the periodic contraction and relaxation of the heart, that is, the periodic pulse of the heart pushes the blood to run along the blood vessels to generate pulse waves. Therefore, the pulse wave is not only affected by the functional state of the heart, but also affected by the vascular resistance, vascular elasticity and blood viscosity in the arteries at all levels. Changes in the physiological characteristics of the cardiovascular system will cause the intensity and shape of the pulse wave signal. , rhythm and rate changes. Therefore, the characteristics of the pulse wave signal can be analyzed and studied, and the physiological and pathological information contained in it can be extracted to provide help for the early diagnosis and prevention of cardiovascular system-related diseases.

Photoplethysmography is generally detected and acquired by photoelectric sensors, so it is often called photoplethysmography. It is usually detected by photoplethysmography (PPG) method. The blood volume recorded by this method changes with time. The change curve is the photoplethysmographic waveform diagram, and the photoplethysmography is also referred to as the photoplethysmography signal or the PPG signal hereinafter.

Specifically, FIG. 2 shows a schematic structural diagram of an apparatus for acquiring a photoplethysmographic pulse wave by using a photoelectric sensor.

As shown in Figure 2, when a light source emits a light beam of a certain wavelength on the surface of human skin (such as the skin of a finger shown in Figure 2), the contraction and expansion of blood vessels will affect the transmission of light at each heartbeat (such as in transmission PPG). , light passing through the fingertip) or a reflection of light (such as in reflective PPG, light coming from near the surface of the finger). There is some attenuation of the light as it passes through the skin tissue and then reflects back to the photodetector. The absorption of light by muscles, bones, veins and other connecting tissues is basically unchanged (if there is no large-scale movement of the measurement site), but the arteries will be different. Because of the pulsation of blood in the arteries, the absorption of light is naturally also subject to change. Therefore, after the optical detector converts the optical signal reflected and/or transmitted by the human body into an electrical signal, since the absorption of the optical signal by the arteries changes while the absorption of the optical signal by other tissues is basically unchanged, the obtained signal can be divided into The characteristics of blood flow can be reflected by extracting the AC signal from the DC signal and the AC signal.

Fig. 3 shows a waveform characteristic diagram of a photoplethysmographic wave.

As shown in Figure 3, a complete pulse waveform has 4 important feature points A, B, C, and D, which include ascending and descending branches. As shown in Figure 3, A is called the main wave, B is called the tidal wave, C is called the peak of the dipole wave, D is called the trough of the dipole wave, OA is the ascending branch of the main wave, and OO' is the pulse wave cycle.

The OA segment is the ascending branch of the pulse waveform, which is due to the systolic ejection of the left ventricle, and the arterial blood pressure rises rapidly, resulting in the expansion of the arterial wall. Point O is the starting point of the cardiac ejection period, and point A is the highest point of aortic pressure, reflecting the maximum pressure and volume in the arteries.

The AD segment is the anterior segment of the descending branch of the pulse waveform, because in the later stage of ventricular ejection, the ejection velocity begins to decrease, causing the blood flow from the aorta to the surrounding area to be greater than the blood flow into the aorta, and the artery changes from dilation to backflow. This process results in a gradual decrease in arterial blood pressure. Point B is the stop point of left ventricular ejection, the peak point of the reflected wave, also called the tidal wave peak, reflecting the tension, compliance and peripheral resistance of the arterial blood vessels. Point D is the trough point of the tidal wave, that is, the dividing point between systole and diastole.

The DO' segment is the posterior segment of the descending branch of the pulse waveform, also known as the dichotomous wave, which is formed by the continuous decrease of arterial blood pressure due to ventricular diastole and the reflux of blood in the aorta to the ventricle. It reflects the functional status of the aorta, the elasticity of blood vessels and the state of blood flow.

(2) Pulse Wave Transit Time (PTT) measurement and Pulse Wave Velocity (PWV) measurement

Specifically, PTT refers to the conduction time of the pulse wave from the heart to the measurement site during arterial ejection. The PWV can be calculated from the PTT based on the positional relationship between the measurement site and the heart. In the existing technical theory, PWV and blood pressure have a linear relationship, and blood pressure can be calculated according to PWV or PTT and related data models.

At present, because the pulse wave velocity PWV is difficult to measure, the existing PWV-based blood pressure detection methods all rely on the detection of PTT.

In some methods, the blood pressure can be estimated by detecting the PTT through a blood pressure detection technology combining electrocardiography (ECG) and PPG.

FIG. 4 shows the relative relationship between the ECG waveform, the PPG waveform, and the PTT.

As shown in FIG. 4 , in the ECG waveform, the R wave represents the contraction of the ventricle, and the time interval between the R wave in the ECG waveform and the main wave in the PPG waveform can be expressed as PPT. Alternatively, the PPT can also be represented by the time interval from the R wave in the ECG waveform to other characteristic points in the PPG waveform.

Specifically, using this method to detect the high-frequency component of systolic blood pressure (Systolic Blood Pressure, SBP) according to PTT and functional equations, the low-frequency component of systolic blood pressure needs to be measured by a more accurate blood pressure method, such as auscultation or According to the oscillometric measurement, the final and more accurate value of systolic blood pressure can be determined according to the sum of the low-frequency and high-frequency components of the systolic blood pressure. Further, according to the functional equation between PTT, relatively accurate systolic blood pressure SBP and diastolic blood pressure (Diastolic Blood Pressure, DPB), a relatively accurate value of diastolic blood pressure DPB can be obtained. In other words, with this method, it is necessary to periodically measure the accurate low-frequency components of blood pressure through external equipment such as a sphygmomanometer, and to calibrate the blood pressure detected by the PPT detection method, so as to obtain more accurate blood pressure detection results.

(3) Pulse Wave Analysis (PWA)

Specifically, the characteristic parameters in the pulse wave can be extracted, and the characteristic parameters with the best correlation with blood pressure can be found by analyzing the correlation between the characteristic parameters and blood pressure, and used as a variable for measuring blood pressure, and then regression analysis is performed to establish a regression Functional equations are used to perform blood pressure measurements.

Optionally, the amplitude of any feature point in the pulse wave shown in FIG. 3 or the time difference between any two feature points can be used as the feature parameter, and the feature parameter and blood pressure are correlated through a large amount of experimental data. performance analysis, and establish a regression function equation. In the actual blood pressure measurement process, the blood pressure is measured according to the characteristic parameters and the regression function equation by detecting the pulse wave and extracting characteristic parameters from it.

The blood pressure detected by this method is calculated by the regression function equation. There are parameters obtained by artificial fitting in the regression function equation. With the change of time and human body differences, the blood pressure measurement results calculated by the regression function equation may have certain errors. . Therefore, using this method also requires regular calibration of the blood pressure measurement results, that is, it is necessary to regularly measure the accurate blood pressure through external equipment such as a sphygmomanometer, calibrate the blood pressure detected according to the PWA detection method, or calibrate the parameters in the regression equation. , so as to obtain more accurate blood pressure detection results. Therefore, based on the above description, it can be seen that the pulse wave can be obtained by using the above-mentioned cuffless blood pressure detection method, and the blood pressure can be obtained by detecting the pulse wave, so that the blood pressure detection device can be carried around. However, each of the above-mentioned cuffless blood pressure detection methods also has the problem of inaccurate blood pressure measurement and troublesome calibration.

Based on this, the present application proposes a cuffless blood pressure detection method and device, which have the advantages of convenience, continuous non-invasive measurement, and high measurement accuracy.

FIG. 5 shows a schematic flowchart of a blood pressure detection method 100 proposed in this application. The blood pressure detection method 100 is applied to a blood pressure detection device, and the blood pressure detection device may be a blood pressure detection device for detecting blood pressure information in the biological information detection system 170 in FIG. 1 , optionally, the blood pressure detection device includes a processor, The processor may be the execution subject of the following blood pressure detection method 100 .

As shown in FIG. 5 , the blood pressure detection method 100 includes the following steps.

S110: Acquire blood pressure calibration information, where the blood pressure calibration information is information obtained by processing according to the first pressure acting on the user and the first photoplethysmography PPG signal when the first pressure acts on the user.

S120: Acquire a second photoplethysmography PPG signal, and process the second PPG signal to obtain the initial blood pressure of the user.

S130: Calibrate the initial blood pressure according to the blood pressure calibration information, and use the calibrated blood pressure as the user's blood pressure.

Specifically, in step S110, the processor obtains the first pressure that can act on the user at the current time and the first photoplethysmography PPG signal when the first pressure acts on the user, and the processor obtains the first photoplethysmography PPG signal according to the first pressure acting on the user. The pressure and the first PPG signal are processed to obtain blood pressure calibration information; or, the processor directly calls the blood pressure calibration information obtained at the previous time.

When the first pressure acts on the user, the blood vessels in the pressure part are deformed, and the blood volume therein changes. Therefore, the first PPG signal changes with the change of the first pressure. The first pressure change relationship determines blood pressure calibration information.

In step S120, when no pressure acts on the user, the processor may acquire the second PPG signal of the user, and process the second PPG signal to obtain the initial blood pressure. The detection of the second PPG signal will not affect the user, and can be acquired for a long time and continuously, and is a non-invasive detection. However, since the second PPG signal does not include pressure change information, the accuracy of the initial blood pressure obtained by processing the second PPG signal is low. If the initial blood pressure is directly provided to the user, the user experience will be affected.

In step S130, the initial blood pressure is calibrated according to the blood pressure calibration information to obtain a relatively accurate blood pressure after calibration, and the calibrated blood pressure is used as the user's current blood pressure and fed back to the user.

In the technical solutions of the embodiments of the present application, the acquired second PPG signal is a PPG signal detected when no pressure acts on the user's body surface, and the accuracy of the initial blood pressure obtained based on the second PPG signal is low. At this time, it is not necessary to perform calibration with external auxiliary equipment such as a sphygmomanometer. The blood pressure calibration information is used to calibrate the initial blood pressure to obtain a relatively accurate blood pressure after calibration, which is fed back to the user as the user's current blood pressure. It is more convenient and can get more accurate blood pressure test results. In addition, if the blood pressure value is determined only by the first PPG signal and the first pressure, the first pressure needs to act on the user every time the blood pressure is detected, which is cumbersome to operate and causes a bad experience for the user. However, in the embodiment of the present application, the blood pressure calibration information obtained by the previous processing can be obtained to calibrate the current initial blood pressure obtained according to the second PPG signal, so there is no need for the first pressure to act on the user every time the blood pressure is detected. The first pressure and the first PPG signal are detected, so that the accuracy of blood pressure detection can be further improved, the convenience of blood pressure detection can be improved, and the user experience can be improved.

Optionally, in the above step S110, the first PPG signal at the first part of the user may be obtained, and in the above step S120, the second PPG signal at the second part of the user may be obtained.

With reference to the relevant description of FIG. 2 above, it can be understood that the blood pressure detection device or the electronic equipment in which it is located includes a PPG detection module, and the PPG detection module includes a light source and a light detector for detecting the first PPG signal and the second PPG signal. .

In some embodiments, the first part and the second part are different parts of the user. In this case, the blood pressure detection device or the electronic device in which the blood pressure detection device is located includes a light source and a light detector corresponding to two different parts, that is, corresponding to the user. The first light source and the first light detector at the first part are used to detect the first PPG signal at the first part; the second light source and the second light detector corresponding to the second part of the user are used to detect the first PPG signal; Second PPG signal at two sites.

As an example, the first part of the user may be the user's finger, such as an index finger, and the above-mentioned first light source and first light detector may be controlled to detect the first PPG signal at the finger. The second part of the user may be the user's wrist, and the second light source and the second light detector can be controlled to detect the second PPG signal at the wrist. In this case, the blood pressure detection device of the embodiment of the present application may be provided in a smart watch, and the first light source and the first light detector may be correspondingly provided on the side of the smart watch, so that the user can detect the first pressure by pressing with a finger and the first PPG signal to obtain blood pressure calibration information, the above-mentioned second light source and second light detector can be correspondingly arranged on the back of the smart watch to detect the second PPG signal at the wrist, which can facilitate the user to perform blood pressure detection. For example, the second light source and the second light detector on the back can facilitate long-term detection of the user's blood pressure (that is, the user does not need to press the watch for a long time), so as to monitor the user's blood pressure for a long time, such as when the user is sleeping. Continuous blood pressure monitoring and monitoring. Then, the blood pressure calibration information obtained by the first pressure and the first PPG signal at the finger is used to calibrate the blood pressure obtained by the second PPG signal at the wrist, so that convenient blood pressure detection can be realized and the blood pressure detection result is more accurate.

Of course, the first part and the second part can also be the same part of the user. For example, the first part and the second part are both the user's wrist or other parts of the user. In this case, the blood pressure detection device or its location The electronic device may only include a light source and a photodetector corresponding to one part, that is, the electronic device may include only one light source and one photodetector, for respectively detecting the first PPG signal and the absence of the first PPG signal when the first pressure acts on the user at different times. The second PPG signal when the pressure acts on the user, if the blood pressure detection device is arranged in the smart watch, the one light source and the one light detector can be correspondingly arranged on the back of the smart watch.

But preferably, the first part and the second part are different parts of the user, respectively, for the following reasons:

First, by testing the PPG signals of different parts of the user and synthesizing the PPG signals of different parts to determine the user's blood pressure, the accuracy of the blood pressure test can be improved.

Secondly, if the first part is the finger and the second part is the wrist, the movement of the wrist is relatively small compared to the finger; and the wrist is suitable for wearing smart terminal devices, such as smart watches, and the second PPG signal comes from the wrist. This makes the wearable device more suitable for long-term continuous blood pressure detection, thereby improving user experience.

Further, pressure needs to be applied to the first part, the finger itself is convenient for applying pressure, and the skin at the finger is thinner than the skin at the wrist, when the pressure signal acts on the finger, the first PPG signal generated by it will follow The first pressure changes obviously, and relatively accurate blood pressure calibration information can be detected, and the blood pressure calibration information can be provided to the second PPG signal generated at the wrist, which can improve the accuracy of the blood pressure tested at the wrist.

Optionally, the above-mentioned first pressure may act on the user in a number of different ways.

For example, in the first embodiment, the above-mentioned first pressure is a pressure signal generated by the user himself. As an example, it may be a pressure signal generated by pressing the first part of the user to the blood pressure detection device. For example, the user's finger points to the blood pressure When the detection device applies pressure, the blood pressure detection device will correspondingly apply a reaction force to the user's finger to form the first pressure.

For another example, in the second embodiment, the above-mentioned first pressure is a pressure signal generated by the blood pressure detection device. As an example, it may be a pressure signal generated by the blood pressure detection device applying pressure to the first part of the user, for example, the blood pressure detection device The device itself applies a pressure signal to the user's finger.

Below, with reference to FIGS. 6 to 8 , the execution process of the blood pressure detection method in the above two embodiments will be described.

FIG. 6 shows a schematic flowchart of the blood pressure detection method 100 in the first embodiment above.

As shown in FIG. 6 , the above step S110 may include the following steps.

S111: control the prompting module to output a prompting signal, where the prompting signal is used to prompt the user to apply pressure to the blood pressure detection device to form the first pressure;

S113: control the first pulse wave detection module to detect the first PPG signal when the first pressure acts on the user;

S114: control the pressure detection module to detect the first pressure;

S115: Receive the first pressure and the first PPG signal, and determine blood pressure calibration information according to the first pressure and the first PPG signal.

Optionally, the prompt signal includes but is not limited to one or more of a text signal, an image signal, a sound signal, a vibration signal or a light signal, and is intended to be used for interacting with the user. Correspondingly, in order to control the prompting module to output the above-mentioned different types of prompting signals, the blood pressure detection device or the electronic equipment where the blood pressure detection device is located may include different types of prompting modules.

For example, after receiving the prompt signal, the user presses the blood pressure detection device through the first part, and the reaction force of the blood pressure detection device on the first part forms the first pressure on the first part. At this time, the processor controls the blood pressure detection device or the first pulse wave detection module in the electronic device where it is located to detect the first PPG signal when the first pressure acts on the user, and controls the pressure detection in the blood pressure detection device or the electronic device where it is located. The module detects the first pressure.

Then, the processor receives the first PPG signal transmitted by the first pulse wave detection module and the first pressure transmitted by the pressure detection module, and determines blood pressure calibration information according to the first pressure and the first PPG signal.

Optionally, the above-mentioned prompt signal is an image signal or a video signal, which can show a specific pressing method to the user. For example, at least some functional modules in the blood pressure detection device, such as the first pulse wave detection module, are arranged on the side of the smart watch, prompting the user. The signal can prompt the user to press in the pressing manner shown in Figure 7, wherein the user's index finger is pressed on one side of the watch, the thumb is pressed on the other side of the watch, and the first pulse wave detection module can be arranged on the thumb or the index finger. Below the pressing method, the stability of pressing can be improved, thereby improving the detection accuracy of the first pressure and the detection accuracy of the first PPG signal.

Further, if the user's finger presses the blood pressure detection device, that is, when the first pressure acts on the user's finger, the first light source in the first pulse wave detection module is controlled to be turned on, and the first light signal is emitted to the user's finger. After the light signal is reflected and/or transmitted by the user's finger, it is received by the first light detector in the first pulse wave detection module to form a first PPG signal.

Optionally, in this embodiment of the present application, the first light source may emit an optical signal of a target wavelength band, and the target wavelength band includes but is not limited to a red light wavelength band or a green light wavelength band, which is used to obtain a first PPG with better signal quality. Signal.

Optionally, the prompt signal may also be used to prompt the user in a manner of applying pressure, for example, increasing the applied pressure, or decreasing the applied pressure. After receiving the prompt signal, the user adjusts the pressing force over time. For example, first apply pressure to the blood pressure detection device with a small pressing force, and then gradually increase the pressing force. The device applies pressure and then gradually reduces the pressure. Alternatively, the pressing force may also be changed in any other manner, which is not specifically limited in this embodiment of the present application.

Further, when the pressing force of the user's finger changes, the first pressure acting on the user's finger changes with time, and the blood volume in the blood vessel inside the finger also changes with time. Therefore, the waveform of the first PPG signal changes with time, and is consistent with the time. Different first pressures correspond.

FIG. 8 shows a schematic flow chart of another blood pressure detection method 100 under the above-mentioned second embodiment.

As shown in FIG. 8 , the above step S110 may include the following steps.

S112: Drive the pressure applying module to apply pressure to the user to form a first pressure;

Optionally, the blood pressure detection device or the electronic device in which it is located includes a pressure application module, and the pressure application module can be used to apply pressure to the user. As an example, in this embodiment of the present application, the processor may drive the pressure applying module to apply pressure to the user to form the first pressure. The pressure applying module includes, but is not limited to, a motor drive unit or other types of drive units, which are not specifically limited in this embodiment of the present application.

Further, when the pressure-applying module is driven to apply pressure to the first part of the user, such as a finger, the processor controls to turn on the first light source in the first pulse wave detection module, and emits a first light signal to the user's finger. After a light signal is reflected and/or transmitted by the user's finger, it is received by the first light detector in the first pulse wave detection module to form a first PPG signal.

Optionally, in some embodiments, the pressure applying module may directly send the pressure it applies to the user to the processor as the first pressure.

Or, in other embodiments, the blood pressure detection device or the electronic device in which the blood pressure detection device is located may include a pressure detection module. Optionally, in the blood pressure detection method 100 shown in FIG. 8 , before step S115 , step S114 may be further included. (The dashed box in FIG. 8 indicates that this step is an optional step): control the pressure detection module to detect the first pressure. Specifically, the processor may control the pressure detection module to detect the pressure exerted by the pressure application module on the user, obtain the first pressure and send it to the processor.

Optionally, the pressure intensity applied by the pressure application module to the user's finger may vary with time, for example, the pressure intensity may change from small to large or from large to small with time, or may also be changed in any other manner, the embodiment of the present application. There is no specific limitation on this.

Further, when the pressure signal applied by the pressure module to the user's finger changes, the first pressure acting on the user's finger changes with time, and the blood volume in the blood vessel inside the finger also changes with time. Therefore, the waveform of the first PPG signal changes with time. change and correspond to different first pressures.

Using the technical solutions of the embodiments of the present application, by controlling the pressure application module to apply pressure to the user to form the first pressure, it is possible to avoid the need for the user to actively press when the blood pressure is detected, thereby improving the user experience, and compared with the user's pressing By controlling the pressure applying module to provide the first pressure to the user, it is also possible to prevent the user's pressing from causing damage to the blood pressure detection device and the electronic equipment where the blood pressure detection device is located.

It can be known from the above description of FIG. 6 and FIG. 8 that the magnitude of the first pressure acting on the user changes with time, and therefore, the detected first PPG signal changes with the magnitude of the first pressure.

In this case, FIG. 9 shows a schematic flowchart of another blood pressure detection method 100 .

As shown in FIG. 9 , the above step S115 may include the following steps.

S1151: Sort the first PPG signals according to the magnitude order of the first pressures to form an envelope signal of the first PPG signals.

S1152: Determine the first blood pressure of the user according to the envelope signal, and use the first blood pressure as blood pressure calibration information.

Optionally, in step S1151, the first PPG signals corresponding to different pressures are arranged in an order of increasing the first pressure from large to small, or in an order from small to large, to form an envelope signal of the first PPG signal. According to the sequence of the first pressure, the formed envelope signal of the first PPG signal can more accurately reflect the relationship between the amplitude of the PPG signal and the change of the first pressure. The signal quality of the envelope signal is good, and the blood pressure detected according to the envelope signal has high accuracy.

It can be understood that steps S1151 and S1152 in FIG. 9 are applied to the embodiment of the blood pressure detection method 100 shown in FIG. 8 , and the steps S1151 and S1152 can also be applied to the blood pressure detection method 100 shown in FIG. 6 . in the example.

FIG. 10 shows a change trend of the corresponding first PPG signal when the first pressure changes from small to high.

As can be seen from FIG. 10 , as the first pressure gradually increases, the amplitude of the first PPG signal gradually increases. When the amplitude reaches the maximum, when the first pressure is increased, the amplitude of the first PPG signal gradually weakens until it disappears. Therefore, the amplitude of the envelope signal formed by the first PPG signal first increases with the pressure, and after reaching the maximum value, it gradually decreases to zero with the increase of the pressure signal.

In step S1152, as an embodiment, the first blood pressure of the user may be determined according to the waveform parameters of the envelope signal and the preset function equation, for example, the current diastolic blood pressure and systolic blood pressure of the user are determined, and the first blood pressure Can be used directly as blood pressure calibration information.

Optionally, the above-mentioned preset functional equation may be a functional equation determined according to multiple sets of experimental data, so as to improve the calculation reliability of the blood pressure calculation through the functional equation and the waveform parameters of the envelope signal.

In order to ensure the accuracy of the blood pressure calibration information, optionally, before the above step S1152, the following steps may be performed:

Determine whether the above-mentioned envelope signal satisfies the preset condition, if yes, execute the above-mentioned step S1151; Detect the new PPG signal generated under the new pressure signal.

Specifically, judging whether the envelope signal satisfies the preset condition is judging whether the signal quality of the envelope signal is good or bad. If the signal quality of the envelope signal is poor, it means that the detected first PPG signal changes with the change of the first pressure. The trend is not obvious, and the first blood pressure detected according to the envelope signal is inaccurate, that is, the blood pressure calibration information is inaccurate.

Optionally, in this embodiment of the present application, the preset conditions of the envelope signal include but are not limited to: the integrity of the envelope signal, the amplitude of the maximum amplitude of the envelope signal, the width of the envelope signal, and the like, This embodiment of the present application does not specifically limit this.

Optionally, in the above steps, if the envelope signal does not meet the preset conditions, it is judged whether the unsatisfied number of times exceeds the threshold value, if it exceeds the threshold value, the blood pressure detection process is ended, and if it does not exceed the threshold value, follow the process of the above step S110. , and re-detect the new PPG signal generated under the new pressure signal.

In this way, it is possible to avoid repeated calibration process under poor test conditions, which wastes system resources and brings bad experience to users.

FIG. 11 shows a schematic flowchart of another blood pressure detection method 100 .

As shown in FIG. 11 , as a possible implementation manner, the foregoing step S120 may include the following steps.

S121: control the second pulse wave detection module to detect the second PPG signal of the user;

S122: Receive the second PPG signal, and use the pulse wave analysis method or the pulse wave transit time measurement method to process the second PPG signal to obtain the initial blood pressure of the user.

Optionally, in step S121, the second light source in the second pulse wave detection module is controlled to be turned on at the target frequency within a preset time period, and the second light detector in the second pulse wave detection module receives the second light source. The light source passes the light signal reflected and/or transmitted by the user to detect the second PPG signal.

As an example, the preset time period is 1s, the target frequency is 50Hz, and the second light source is turned on multiple times at a frequency of 50Hz, that is, the first light source is turned on every 20ms, so as to detect the second PPG signal within 1s.

Certainly, the preset time period and the target frequency may also be any other preset values, which are not specifically limited in the embodiment of the present application. It can be understood that, the longer the preset time period is and the higher the target frequency is, the higher the detection accuracy of the second PPG signal is.

Optionally, in this embodiment of the present application, the second light source may emit an optical signal of a target wavelength band, where the target wavelength band includes but is not limited to a red light wavelength band or a green light wavelength band, which is used to obtain a second PPG with better signal quality. Signal.

Optionally, in addition to controlling the second pulse wave detection module to detect the user's second PPG signal in step S121, the first pulse wave detection module may also be controlled to detect the user's second PPG signal. That is, the first pulse wave detection module is controlled to detect the first PPG signal and the second PPG signal of the same part of the user at different time periods, wherein the first PPG signal is the PPG signal when the first pressure acts on the user, and the second PPG signal is the PPG signal when the first pressure acts on the user. It is the PPG signal when no pressure acts on the user.

Further, as shown in FIG. 11 , after the second PPG signal is detected in step S121, in step S122, the above-mentioned PTT measurement method or PWA analysis method can be used to process the second PPG signal to obtain the initial blood pressure of the user, Alternatively, other related technical methods may also be used to obtain the initial blood pressure of the user according to the second PPG signal, which is not specifically limited in this embodiment of the present application.

Specifically, if the PTT measurement method is used to measure blood pressure, the ECG signal corresponding to the second PPG signal needs to be measured, and the PTT is determined according to the ECG signal and the second PPG signal, so as to determine the AC component of the user's current blood pressure, that is, the initial blood pressure.

Optionally, as shown in FIG. 11 , the above step S130 may include the following steps.

S131: Use the blood pressure calibration information as the direct current component of the user's blood pressure, and use the initial blood pressure as the alternating current component of the user's blood pressure.

S132: Calibrate the AC component of the user's blood pressure according to the DC component of the user's blood pressure, and use the calibrated blood pressure as the user's blood pressure.

In this embodiment, the blood pressure calibration information acquired in step S110 may be the above-mentioned first blood pressure. In steps S131 and S132, the first blood pressure is taken as the DC component of the user's current blood pressure, and the initial blood pressure is taken as the user's current blood pressure The current blood pressure of the user is determined according to the first blood pressure and the initial blood pressure, and is fed back to the user as an output.

Or, in some other embodiments, in the process of processing the second PPG signal by using the above-mentioned PTT measurement method or PWA analysis method, a function equation is used to calculate the blood pressure, and according to the above-mentioned blood pressure calibration information, for example, the first blood pressure , the function equation parameters in the second PPG signal processing process are calibrated, so that the initial blood pressure calculated according to the second PPG signal and the calibrated functional equation is close to or even equal to the first blood pressure, and the first blood pressure or the initial blood pressure is used as The user's current blood pressure, output feedback to the user.

The blood pressure tested in this way is relatively accurate, and long-term and continuous blood pressure measurement can be realized, which can improve user experience.

Based on the blood pressure detection method 100 shown above in FIG. 5 , FIG. 12 shows a schematic diagram of another blood pressure detection method 100 .

As shown in FIG. 12 , the blood pressure detection method 100 may further include:

S140: Determine whether the user is in an exercise state.

If not, step S120 and step S130 are executed to obtain a second PPG signal, process the second PPG signal to obtain the user's initial blood pressure, and determine the user's blood pressure according to the blood pressure calibration information and the initial blood pressure.

If so, step S120 and step S130 are not performed, and after a preset time period, step S140 is performed again, that is, it is re-determined whether the user is in the exercise state.

Since the relative movement between the optical sensor (including the light source and the light detector) and the skin will reduce the sensitivity of the light signal, if the user is in a state of motion, the detection of the second PPG signal will be greatly disturbed. Therefore, before acquiring the second PPG, the state of the user is first determined, and the second PPG signal is detected and acquired when the user is in a non-exercise state, which can improve the accuracy of blood pressure detection.

Optionally, the state of the user can be sensed through a motion sensor. The motion sensor includes but is not limited to an accelerometer. If the user is in a stationary state, the accelerations of the three axes of XYZ in the accelerometer are all 0. The second PPG signal quality is the best.

In some embodiments, it can be determined whether the user is in a motion state by determining whether the acceleration of the three axes of XYZ in the accelerometer is within the range of a preset threshold value. The preset thresholds may all be 0, or at least one of them may be 0, or may be other preset thresholds, which are not specifically limited in this embodiment of the present application.

The various blood pressure detection methods provided in the embodiments of the present application are described above with reference to FIG. 5 to FIG. 12 . The same blood pressure detection device is used to detect different PPG signals in two detection methods during a blood pressure detection process. And combining the results obtained in the two detection methods, the user's blood pressure is jointly determined, and the accuracy of blood pressure detection is improved while realizing convenient blood pressure detection.

In addition, it should be noted that when the first PPG signal is detected above, the first pressure needs to act on the body surface of the user. During a measurement process, the first pressure is a pressure signal that acts on the user in a short time. The blood pressure measured by this method is relatively accurate, but it is not suitable for long-term or frequent use of blood pressure detection, and the long-term or frequent pressure on the user's body surface will result in poor user experience.

In order to solve the above problem, the embodiment of the present application proposes another blood pressure detection method. On the basis of the above blood pressure detection method 100, that is, on the basis of determining the blood pressure calibration information, in the subsequent blood pressure detection process, before the blood pressure detection , first determine whether the calibration is currently updated, and if the calibration is updated, re-acquire new blood pressure calibration information, the new blood pressure calibration information is based on the first PPG signal when the first pressure is re-applied to the user and the re-applied first PPG signal. A new blood pressure calibration information obtained by pressure processing. In addition, a new second PPG signal when no pressure acts on the user is acquired again, a new initial blood pressure is determined, and the new initial blood pressure is calibrated in combination with the new blood pressure calibration information to determine the user's new blood pressure. If the calibration is not updated, the previous blood pressure calibration information is directly called to obtain a new second PPG signal when no pressure acts on the user, and after determining the new initial blood pressure, the new initial blood pressure is directly based on the previous blood pressure calibration information. Calibrate to determine the user's new blood pressure.

As an implementation manner, before acquiring the blood pressure calibration information, whether to perform calibration may be determined according to first information, where the first information includes but is not limited to: current time information and/or user input information.

Specifically, if the first information is current time information, it is determined whether the current time information is within the preset time range, if the current time information is within the preset time range, then calibration is performed, otherwise, if the time information is not within the preset time within the range, no calibration is performed.

As an example, the preset time range may be a time period preset by a user, such as the same time period every month, or a time period every day, or any other preset time period. The time information is current time information, and it is determined whether the current time is within a preset time period to determine whether to calibrate the blood pressure detection device.

Specifically, if the first information is user input information, the user input information is used to indicate whether the user needs to calibrate the blood pressure detection device, and the blood pressure detection device is calibrated according to the user's needs.

Optionally, in this embodiment of the present application, the user's blood pressure can be continuously detected with a preset time period as a period, and each time the user's blood pressure is detected, the first information, for example, current time information can be flexibly determined. and/or user input information, etc., to determine whether to perform calibration, that is, to determine whether to obtain new blood pressure calibration information. On the one hand, during the calibration period of blood pressure detection, the calibration information can be updated according to user needs or periodically to improve the accuracy of blood pressure detection. On the other hand, it is possible to take into account the user experience. In the non-calibration period of blood pressure detection, long-term continuous blood pressure detection is performed based on the previous calibration information and the PPG signal obtained by continuous detection, and a long-term blood pressure detection service is provided.

The blood pressure detection method provided by the present application is described above with reference to FIGS. 5 to 12 , and the blood pressure detection device provided by the present application is described below with reference to FIGS. 13 to 19 . It can be understood that the blood pressure detection device described in the following embodiments, It can be a device for performing the above-mentioned blood pressure detection method, and for related technical features, please refer to the above related description.

As shown in FIG. 13 , a blood pressure detection device 101 may include: a processor 11, and the processor 11 is configured to:

Optionally, in other embodiments, the processor 11 is configured to:

Controlling the prompting module 15 to output a prompting signal, the prompting signal is used to prompt the user to apply pressure to the blood pressure detection device to form the first pressure;

controlling the first pulse wave detection module 13 to detect the first PPG signal when the first pressure acts on the user;

control the pressure detection module 14 to detect the first pressure;

The first pressure and the first PPG signal are received, and the blood pressure calibration information is determined according to the first pressure and the first PPG signal.

Optionally, as shown in FIG. 14 , the blood pressure detection device 101 in this embodiment of the present application may further include the above-mentioned prompt module 15 , a first pulse wave detection module 13 and a pressure detection module 14 .

Optionally, the first pulse wave detection module 13 may include: a first light source 121 , a first light detector 122 and a first signal processing module 123 .

Optionally, the first light source 121 is used to emit a first light signal to the first part of the user, and there is a first pressure acting on the first part of the user, and the first light signal passes through the reflection of the blood vessels in the first part and After/or after transmission, it is received by the first photodetector 122. After the optical signal received by the first photodetector 122 undergoes photoelectric conversion, the formed electrical signal is transmitted to the first signal processing module 123 for signal processing to form an electrical signal. The first PPG signal.

Optionally, the first light source 121 includes, but is not limited to, one or more point light sources, for example, a light-emitting diode (Light-Emitting Diode, LED), a laser diode (Laser Diode, LD) or an infrared emitting diode, which also It may be a linear light source or a planar light source, which is not specifically limited in this embodiment of the present application. The first light source 121 may be configured to emit first light signals of one or more target wavelength bands. As an example, the target wavelength band may be a red light wavelength band or a green light wavelength band.

Optionally, the first photodetector 122 includes, but is not limited to, a photodiode (PD), a phototransistor, etc., which are used for photoelectric conversion. The first signal processing module 123 may include signal processing circuits such as an amplifier circuit, a low-pass filter circuit, and an analog-to-digital conversion circuit, which are used to optimize the signal quality to improve the blood pressure detection effect.

Optionally, the pressure detection module 14 may include a pressure sensor for sensing the first pressure, the pressure sensor includes but is not limited to: piezoelectric pressure sensor, piezoresistive pressure sensor, capacitive pressure sensor, inductive pressure sensor A pressure sensor, or other types of pressure sensors, are not specifically limited in this embodiment of the present application.

Specifically, the first light source 121 and the first light detector 122 may be located on the same side or opposite side of the first part of the user, for receiving reflected light and/or transmitted light after passing through the first part to form the first PPG signal.

As an example, the first light source 121 and the first light detector 122 are both located on the same side of the first part of the user. For example, the blood pressure detection device 101 is set on a smart watch, and the first light source 121 and the first light detector 122 are adjacent to each other. Settings, which can be located on the side of the smartwatch or in a button on the side of the smartwatch.

Optionally, the pressure detection module 14 can be arranged on the side of the smart watch together with the first light source 121 and the first light detector 122, and it can be stacked with the first light source 121 and the first light detector 122, or, it can also be It is arranged horizontally with the first light source 121 and the first light detector 122 .

Specifically, the processor 11 is configured to control the prompting module 12 to output a prompting signal, where the prompting signal is used to prompt the user to apply pressure to the blood pressure detection device to form the first pressure;

Optionally, the prompt signal includes but is not limited to one or more of a text signal, an image signal, a sound signal, a vibration signal or a light signal, and is intended to be used for interacting with the user. Correspondingly, the prompt module 12 includes, but is not limited to, functional units such as a display unit, a light-emitting unit, a sound unit, or a vibration unit.

After receiving the prompt signal, the user applies pressure to the blood pressure detection device 101 through the first part to generate the first pressure at the first part. As an example, the prompt module 12 is a display unit. For example, the display screen of a smart watch can be reused as Prompt module 12, the display screen is used for outputting prompt signals, such as outputting the picture or video of the pressing gesture shown in FIG. 7. After receiving the prompt signal, the user presses his finger to the side of the watch according to Press on the buttons on the side of the watch, that is, press on the corresponding positions of the first light source 121 and the first light detector 122 .

Optionally, the prompt signal may be used to prompt the user that the intensity of the pressure applied to the blood pressure detection device 101 changes from high to low or from low to high, and the first pressure detected by the pressure detection module 14 changes from high to low or from low to high. The user applies pressure to the blood pressure detection device 101 in this way, and the change trend of the first pressure is the same. The processor 11 can conveniently sort the first PPG signals corresponding to the first pressure according to the magnitude of the first pressure to obtain the signal. The envelope signal with better quality is used to detect the user's blood pressure to obtain blood pressure correction information.

15 to 17 show a top view, bottom view and side view of a smart watch, specifically, FIG. 15 is a top view of the smart watch, that is, the front of the smart watch; FIG. 16 is a bottom view of the smart watch, that is is the back of the smart watch; Figure 17 is a side view of the smart watch, that is, the side of the smart watch.

As shown in FIG. 15 to FIG. 17 , the first light source 121 and the first light detector 122 are arranged on the side buttons of the smart watch, and the pressure detection module 14 is arranged on the first light source 121 and the first light detector 122 close to the inside of the watch. On one side, it is stacked with the first light source 121 and the first light detector 122 .

It should be noted that, in the embodiments shown in FIGS. 15 to 17 , the pressure detection module 14 may be located inside the watch, and the first light source 121 and the first light detector 122 may be located inside the keys. Therefore, in FIGS. 15 to 17 , The pressure detection module 14 , the first light source 121 and the first light detector 122 are marked with dashed boxes.

Optionally, the processor 11 is further configured to: control the second pulse wave detection module 13 to detect the second PPG signal of the user;

The second PPG signal is received, and the second PPG signal is processed by the pulse wave analysis method or the pulse wave transit time measurement method to obtain the initial blood pressure of the user.

Optionally, as shown in FIG. 14 , the blood pressure detection apparatus 101 in this embodiment of the present application may further include the above-mentioned second pulse wave detection module 13 .

As an example, the second pulse wave detection module 13 may include: a second light source 131 , a second light detector 132 and a second signal processing module 133 .

Specifically, the second light source 131 can be a point light source, the number of which is one or more, and is used to transmit second optical signals of different target wavelength bands to the second part of the user, and the second optical signals pass through the second part of the user. After the blood vessel is reflected or transmitted, it is received by the second light detector 132. The number of the second light detectors 132 can also be one or more, and the light received by the one or more second light detectors 132 After the signal undergoes photoelectric conversion, the formed electrical signal is transmitted to the second signal processing module 133 for signal processing to form a second PPG signal.

Optionally, both the second light source 131 and the second photodetector 132 may be located on the same side of the second part of the user. For example, the blood pressure detection device 101 is arranged on a smart watch, the second light source 131 and the second photodetector 132 is placed adjacent, which can be located on the back of the smartwatch.

As shown in FIG. 15 to FIG. 17 , the smart watch includes a plurality of second light sources 131 and a plurality of second light detectors 132, wherein the plurality of second light sources 131 can emit second light signals of at least two different wavelength bands, The plurality of second light sources 131 are disposed at the center of the back of the watch, and the plurality of second light detectors 132 surround the plurality of second light sources 131 .

As shown in FIG. 14 , in this embodiment of the present application, the processor 11 is configured to perform signal interaction with the first pulse wave detection module 12 , the second pulse wave detection module 13 , the prompt module 15 and the pressure detection module 14 . In order to generate a control signal, the first pulse wave detection module 12, the second pulse wave detection module 13, the prompt module 15 and the pressure detection module 14 are controlled to perform corresponding functional actions, and can also be used to receive the above-mentioned first pulse wave detection module 12, The second pulse wave detection module 13 and the pressure detection module 14 detect various types of signals, such as the first pressure, the first PPG signal and the second PPG signal, etc., and are used to perform signal processing on the various signals to obtain the blood pressure detection result. .

Optionally, in other embodiments, the processor 11 is configured to:

driving the pressing module 16 to apply the first pressure to the user to form the first pressure;

controlling the first pulse wave detection module 12 to detect the first PPG signal when the first pressure acts on the user;

Optionally, in some embodiments, the first pressure received by the processor 11 may be the first pressure sent to it by the pressure applying module 16 .

Optionally, in other embodiments, the processor 11 is further configured to: control the pressure detection module 14 to detect the first pressure. The first pressure received by the processor 11 is the first pressure sent to it by the pressure detection module 14 .

Optionally, as shown in FIG. 18 , the blood pressure detection device 101 in this embodiment of the present application may further include the aforementioned pressure applying module 16 and the first pulse wave detection module 12 .

Optionally, in some embodiments, the blood pressure detection device 101 may further include: a pressure detection module 14 .

Further, the blood pressure detection device 101 may further include: a second pulse wave detection module 13 .

Specifically, in this embodiment of the present application, for the first pulse wave detection module 12 , the second pulse wave detection module 13 , and the pressure detection module 14 , reference may be made to the relevant description of FIG. 14 above, and details are not repeated here.

In this embodiment of the present application, the processor 11 is configured to control the pressure applying module 16 to apply pressure to the user, so as to form the first pressure acting on the user. Optionally, the processor 11 is configured to control the intensity of the pressure applied to the user by the pressure applying module from high to low or from low to high, therefore, the formed first pressure changes from high to low or from low to high. In some embodiments, the pressure applying module 16 includes, but is not limited to, a motor drive module or other types of drive modules, which are not specifically limited in the embodiments of the present application.

Optionally, if the first light source 121 and the first light detector 122 are arranged on the buttons of the watch, the pressing module 16 may be arranged on one side of the buttons to provide pressure to the buttons.

FIG. 19 shows a bottom view of a smart watch including the pressure applying module 16 , that is, a schematic view of the back of the smart watch.

As an example, as shown in FIG. 19 , the pressure applying module 16 may be disposed between the first light source 121 , the first light detector 122 and the pressure detecting module 14 , so that the first light source 121 and the first light detector 122 can perform the first The detection of the PPG signal is also convenient for it to apply pressure to the user by applying pressure to the module where the first light source 121 and the first light detector are located, so as to generate the first pressure. In addition, the pressure applying module 16 and the pressure detecting module 14 are in phase. The adjacent arrangement is also convenient for the pressure detection module 14 to perform pressure detection.

It can be understood that, in addition to the pressure applying module 16 , other functional modules in FIGS. 18 and 19 may refer to the relevant descriptions of FIGS. 15 to 18 above, and will not be repeated here. In addition, FIG. 15 to FIG. 17 and FIG. 19 only take a smart watch as an example to illustrate the related structure of the blood pressure detection device 101 provided by the embodiment of the present application, and it is not limited that the blood pressure detection device 101 in the embodiment of the present application is only provided on the smart watch It can also be installed in any other type of electronic device such as a mobile phone, a computer, or a biological information detection device, which is not specifically limited in this embodiment of the present application.

In addition, for the processor 11, in addition to being configured to implement the relevant functions described above in FIGS. 13 , 14 and 18 , it can also be configured to implement the relevant steps in the blood pressure detection method 100 above.

Optionally, for the first pressure and the first PPG signal, the processor 11 may be configured to: sort the first PPG signals according to the magnitude of the first pressure to form an envelope signal of the first PPG signal; The waveform parameters of the network signal and the preset function equation are used to determine the first blood pressure of the user; the first blood pressure is used as the blood pressure calibration information.

Optionally, for the calibration process between the blood pressure calibration information and the initial blood pressure, the processor 11 may be configured to: take the initial blood pressure as the AC component of the user's blood pressure, use the blood pressure calibration information as the DC component of the user's blood pressure, and obtain the user's blood pressure through calibration. blood pressure.

In some embodiments, before the processor 11 is configured to acquire the second PPG signal, the processor 11 is further configured to: determine whether the user is in an exercise state;

If not, the processor 11 is configured to: acquire the second PPG signal;

If so, the processor 11 is configured to re-determine whether the user is in an exercise state after an interval of a preset time period.

In some embodiments, the processor 11 is configured to: determine whether the acceleration value of the accelerometer is within the range of a preset threshold, and determine whether the user is in a motion state.

Optionally, in some implementation manners, the blood pressure detection apparatus 101 in this embodiment of the present application may include an accelerometer or other types of motion sensors. In other embodiments, the accelerometer or other types of motion sensors may also be provided in the electronic device where the blood pressure detection apparatus 101 is located, which is not specifically limited in this embodiment of the present application.

Optionally, the processor 11 is configured to: acquire the first PPG signal at the first part of the user;

A second PPG signal is acquired at a second site of the user, wherein the second site is different from the first site.

Optionally, the first part is the user's finger, and the second part is the user's wrist.

An embodiment of the present application further provides a blood pressure detection device, including a processor and a memory, where the memory is used to store a computer program, and the processor is used to call the computer program to execute the blood pressure detection method 100 in any of the foregoing application embodiments.

An embodiment of the present application further provides an electronic device, and the electronic device may include the blood pressure detection apparatus 101 in any of the foregoing embodiments of the application.

Optionally, the electronic device may be a smart watch or a mobile phone, and the blood pressure detection device 101 may be disposed on any surface of the electronic device, for example, may be disposed on the back or side of the electronic device.

Further, the above-mentioned blood pressure detection device 101 can be arranged in a button on the surface of the electronic device, and the button can be used only for blood pressure detection, and can also realize other functions of the electronic device on the basis of blood pressure detection.

It should be understood that the processing unit or the processor in this embodiment of the present application may be an integrated circuit chip, which has a signal processing capability. In the implementation process, each step of the above method embodiments may be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software. The above-mentioned processor can be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other available Programming logic devices, discrete gate or transistor logic devices, discrete hardware components. The methods, steps, and logic block diagrams disclosed in the embodiments of this application can be implemented or executed. It can be understood that the blood pressure detection device of the embodiment of the present application may further include a storage unit or a memory, and the memory may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memory.

An embodiment of the present application also provides a computer-readable storage medium, where the computer-readable storage medium stores one or more programs, and the one or more programs include instructions, and the instructions, when used by a portable electronic device including multiple application programs When executed, the portable electronic device can be made to execute the methods of the embodiments shown above.

The embodiments of the present application also provide a computer program, where the computer program includes instructions, when the computer program is executed by a computer, the computer can perform the method of the above-described embodiments.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that make contributions to the prior art or the parts of the technical solutions, and the computer software products are stored in a storage medium , including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program codes .

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

A blood pressure detection method, applied to a blood pressure detection device, is characterized in that, comprising:

acquiring blood pressure calibration information, the blood pressure calibration information being information obtained by processing a first photoplethysmography PPG signal when the first pressure acts on the user and the first photoplethysmography when the first pressure acts on the user;

acquiring a second photoplethysmography PPG signal, and processing the second photoplethysmography PPG signal to obtain the initial blood pressure of the user;

The initial blood pressure is calibrated according to the blood pressure calibration information, and the calibrated blood pressure is used as the blood pressure of the user.
The blood pressure detection method according to claim 1, wherein the acquiring blood pressure calibration information comprises:

driving the pressure applying module to apply pressure to the user to form the first pressure;

controlling the first pulse wave detection module to detect the first photoplethysmography PPG signal when the first pressure acts on the user;

controlling the pressure detection module to detect the first pressure;

The first pressure and the first photoplethysmography PPG signal are received, and the blood pressure calibration information is determined according to the first pressure and the first photoplethysmography PPG signal.
The blood pressure detection method according to claim 1, wherein the acquiring blood pressure calibration information comprises:

controlling the prompting module to output a prompting signal, the prompting signal is used to prompt the user to apply pressure to the blood pressure detection device to form the first pressure;

controlling the first pulse wave detection module to detect the first photoplethysmography PPG signal when the first pressure acts on the user;

controlling the pressure detection module to detect the first pressure;

The first pressure and the first photoplethysmography PPG signal are received, and the blood pressure calibration information is determined according to the first pressure and the first photoplethysmography PPG signal.
The blood pressure detection method according to claim 2 or 3, wherein the first pressure changes from high to low or from low to high with time.
The blood pressure detection method according to any one of claims 1 to 4, wherein the acquiring a second photoplethysmography PPG signal, and processing the second photoplethysmography PPG signal to obtain the second photoplethysmography PPG signal. The user's initial blood pressure, including:

controlling the second pulse wave detection module to detect the second photoplethysmography PPG signal of the user;

Receive the second photoplethysmography PPG signal, and use the pulse wave analysis method or the pulse wave transit time measurement method to process the second photoplethysmography PPG signal to obtain the initial blood pressure of the user .
The blood pressure detection method according to any one of claims 1 to 5, wherein the first pressure varies with time, and the PPG signal is recorded according to the first pressure and the first photoplethysmography Determining the blood pressure calibration information includes:

Sorting the first photoplethysmography PPG signals corresponding to the first pressure according to the magnitude of the first pressure to form an envelope signal of the first photoplethysmography PPG signal;

determining the first blood pressure of the user according to the envelope signal;

The first blood pressure is used as the blood pressure calibration information.
The blood pressure detection method according to claim 6, wherein the calibrating the initial blood pressure according to the blood pressure calibration information, and using the calibrated blood pressure as the blood pressure of the user, comprises:

using the blood pressure calibration information as the DC component of the user's blood pressure;

using the initial blood pressure as an AC component of the user's blood pressure;

The AC component of the user's blood pressure is calibrated according to the DC component of the user's blood pressure, and the calibrated blood pressure is used as the user's blood pressure.
The blood pressure detection method according to any one of claims 1 to 7, wherein before the acquiring the second photoplethysmography PPG signal, the blood pressure detection method further comprises:

determining whether the user is in motion;

If not, acquiring the second photoplethysmography PPG signal;

If so, after an interval of a preset time period, it is re-determined whether the user is in an exercise state.
The blood pressure detection method according to any one of claims 1 to 8, wherein the acquiring the first photoplethysmography PPG signal comprises:

acquiring the first photoplethysmography PPG signal at the first part of the user;

The acquiring the second photoplethysmography PPG signal includes:

The second photoplethysmography PPG signal is acquired at a second site of the user, wherein the second site is different from the first site.
The blood pressure detection method according to claim 9, wherein the first part is the user's finger, and the second part is the user's wrist.
A blood pressure detection device, characterized in that it includes a processor, and the processor is configured to:

acquiring blood pressure calibration information, the blood pressure calibration information being information obtained by processing a first photoplethysmography PPG signal when the first pressure acts on the user and the first photoplethysmography when the first pressure acts on the user;

acquiring a second photoplethysmography PPG signal, and processing the second photoplethysmography PPG signal to obtain the initial blood pressure of the user;

The initial blood pressure is calibrated according to the blood pressure calibration information, and the calibrated blood pressure is used as the blood pressure of the user.
The blood pressure detection device of claim 11, wherein the processor is configured to:

driving the pressing module to apply the first pressure to the user to form the first pressure;

controlling the first pulse wave detection module to detect the first photoplethysmography PPG signal when the first pressure acts on the user;

controlling the pressure detection module to detect the first pressure;

The first pressure and the first photoplethysmography PPG signal are received, and the blood pressure calibration information is determined according to the first pressure and the first photoplethysmography PPG signal.
The blood pressure detection device according to claim 12, wherein the blood pressure detection device further comprises: the pressure applying module electrically connected to the processor and the first pulse rate electrically connected to the processor Wave detection module.
The blood pressure detection device of claim 11, wherein the processor is configured to:

controlling the prompting module to output a prompting signal, the prompting signal is used to prompt the user to apply pressure to the blood pressure detection device to form the first pressure;

Controlling the first pulse wave detection module to detect the first photoplethysmography PPG signal when the first pressure acts on the user;

controlling the pressure detection module to detect the first pressure;

The first pressure and the first photoplethysmography PPG signal are received, and the blood pressure calibration information is determined according to the first pressure and the first photoplethysmography PPG signal.
The blood pressure detection device according to claim 14, wherein the blood pressure detection device further comprises: the prompting module electrically connected to the processor and the first pulse wave electrically connected to the processor detection module.
The blood pressure detection device according to claim 12 or 14, wherein the first pressure changes from high to low or from low to high with time.
The blood pressure detection device according to any one of claims 11 to 16, wherein the processor is configured to:

controlling the second pulse wave detection module to detect the second photoplethysmography PPG signal of the user;

Receive the second photoplethysmography PPG signal, and use the pulse wave analysis method or the pulse wave transit time measurement method to process the second photoplethysmography PPG signal to obtain the initial blood pressure of the user .
The blood pressure detection device according to claim 17, wherein the blood pressure detection device further comprises: the second pulse wave detection module electrically connected to the processor.
The blood pressure detection device according to any one of claims 11 to 18, wherein the first photoplethysmography PPG signal varies with the magnitude of the first pressure;

The processor is configured to: sort the first photoplethysmography PPG signal according to the magnitude of the first pressure to form an envelope signal of the first photoplethysmography PPG signal;

determining the first blood pressure of the user according to the envelope signal;

The first blood pressure is used as the blood pressure calibration information.
The blood pressure detection device of claim 19, wherein the processor is configured to:

using the blood pressure calibration information as the DC component of the user's blood pressure,

using the initial blood pressure as an AC component of the user's blood pressure;

The AC component of the user's blood pressure is calibrated according to the DC component of the user's blood pressure, and the calibrated blood pressure is used as the user's blood pressure.
The blood pressure detection device according to any one of claims 11 to 20, wherein before the processor is configured to acquire the second photoplethysmography PPG signal, the processor is further configured to: determine whether the user is in motion;

If not, acquiring the second photoplethysmography PPG signal;

If so, after an interval of a preset time period, it is re-determined whether the user is in an exercise state.
The blood pressure detection device according to any one of claims 11 to 21, wherein the processor is configured to:

acquiring the first photoplethysmography PPG signal at the first part of the user;

The second photoplethysmography PPG signal is acquired at a second site of the user, wherein the second site is different from the first site.
The blood pressure detection device according to claim 22, wherein the first part is the user's finger, and the second part is the user's wrist.
An electronic device, comprising:

The blood pressure detection device according to any one of claims 11 to 23.
The electronic device according to claim 24, wherein the electronic device is a smart watch.